<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- <form action="">
        <input type="text">
    </form> -->
    <!-- <form action="">
        <input type="password">
    </form> -->
    <!-- <form action="">
        <input type="radio" name="sex" checked="checked">男
        <input type="radio" name="sex">女
    </form> -->
    <!-- <form action="">
        <input type="checkbox"> 吃饭
        <input type="checkbox">睡觉
        <input type="checkbox">打豆豆
    </form> -->
    <!-- <form action="">
        <input type="button" value="这是一个按钮" onclick="alert('hello')">
    </form> -->
    <!-- <form action="http://www.baidu.com">
        <input type="text">
        <input type="submit" value="提交">
        <input type="reset" value="清空">
    </form> -->
    <!-- <form action="">
        <input type="file">
    </form> -->
    <label for="male">男</label>
    <input id="male" type="radio" name="sex">
</body>
</html>